package com.cci.kangdao.utilTool;

import com.jcraft.jsch.*;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;
import java.util.Vector;

public class SFTPUtil {
    private transient Logger log = LoggerFactory.getLogger(this.getClass());
    private ChannelSftp sftp;
    private Session session;
    /** FTP 登录用户名*/
    private String username;
    /** FTP 登录密码*/
    private String password;
    /** 私钥 */
    private String privateKey;
    /** FTP 服务器地址IP地址*/
    private String host;
    /** FTP 端口*/
    private int port;
    /**
     * 构造基于密码认证的sftp对象
     * @param username
     * @param password
     * @param host
     * @param port
     */
    public SFTPUtil(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }
    /**
     * 构造基于秘钥认证的sftp对象
     * @param username
     * @param host
     * @param port
     * @param privateKey
     */
    public SFTPUtil(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }
    public SFTPUtil(){}
    /**
     * 连接sftp服务器
     *
     * @throws Exception
     */
    public void login(){
        try {
            JSch jsch = new JSch();
            if (privateKey != null) {
                jsch.addIdentity(privateKey);// 设置私钥
                log.info("sftp connect,path of private key file：{}" , privateKey);
            }
            log.info("sftp connect by host:{} username:{}",host,username);
            session = jsch.getSession(username, host, port);
            log.info("Session is build");
            if (password != null) {
                session.setPassword(password);
            }
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
            config.put("PreferredAuthentications","publickey,keyboard-interactive,password");
            session.setConfig(config);
            session.connect();
            log.info("Session is connected");
            Channel channel = session.openChannel("sftp");
            channel.connect();
            log.info("channel is connected");
            sftp = (ChannelSftp) channel;
            log.info(String.format("sftp server host:[%s] port:[%s] is connect successfull", host, port));
        } catch (JSchException e) {
            log.error("Cannot connect to specified sftp server : {}:{} \n Exception message is: {}", new Object[]{host, port, e.getMessage()});
        }
    }

    /**
     * 关闭连接 server
     */
    public void logout(){
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
                log.info("sftp is closed already");
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
                log.info("sshSession is closed already");
            }
        }
    }

    /**
     * 将输入流的数据上传到sftp作为文件
     *
     * @param directory
     *            上传到该目录
     * @param sftpFileName
     *            sftp端文件名
     * @param input
     */
    public void upload(String directory, String sftpFileName, InputStream input){
        try {
            log.info("directory:" + directory + ";sftpFileName:" + sftpFileName);
            sftp.cd(directory);
        } catch (SftpException e) {
            log.warn("directory is not exist");
            try {
                sftp.mkdir(directory);
                sftp.cd(directory);
            } catch (SftpException ex) {
                log.error(e.getMessage(), e);
            }
        }
        try {
            sftp.put(input, sftpFileName);
        } catch (SftpException e) {
            log.error(e.getMessage(), e);
        }
        log.info("file:{} is upload successful" , sftpFileName);
    }

    /**
     * 上传单个文件
     *
     * @param directory
     *            上传到sftp目录
     * @param uploadFile
     *            要上传的文件,包括路径
     */
    public void upload(String directory, String uploadFile){
        try {
            File file = new File(uploadFile);
            upload(directory, file.getName(), new FileInputStream(file));
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }

    /**
     * 将byte[]上传到sftp，作为文件。注意:从String生成byte[]是，要指定字符集。
     *
     * @param directory
     *            上传到sftp目录
     * @param sftpFileName
     *            文件在sftp端的命名
     * @param byteArr
     *            要上传的字节数组
     */
    public void upload(String directory, String sftpFileName, byte[] byteArr) {
        upload(directory, sftpFileName, new ByteArrayInputStream(byteArr));
    }

    /**
     * 将字符串按照指定的字符编码上传到sftp
     *
     * @param directory
     *            上传到sftp目录
     * @param sftpFileName
     *            文件在sftp端的命名
     * @param dataStr
     *            待上传的数据
     * @param charsetName
     *            sftp上的文件，按该字符编码保存
     */
    public void upload(String directory, String sftpFileName, String dataStr, String charsetName){
        try {
          upload(directory, sftpFileName, new ByteArrayInputStream(dataStr.getBytes(charsetName)));
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }

    /**
     * 下载文件
     *
     * @param directory
     *            下载目录
     * @param downloadFile
     *            下载的文件
     * @param saveFile
     *            存在本地的路径
     */
    public void download(String directory, String downloadFile, String saveFile) {
        try {
            if (directory != null && !"".equals(directory)) {
                sftp.cd(directory);
            }
            File file = new File(saveFile);
            sftp.get(downloadFile, new FileOutputStream(file));
            log.info("file:{} is download successful", downloadFile);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }

    /**
     * 下载文件
     * @param directory 下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     */
    public byte[] download(String directory, String downloadFile){
        log.info("directory:" + directory + ";downloadFile:" + downloadFile);
        byte[] fileData = null;
        try {
            if (directory != null && !"".equals(directory)) {
                sftp.cd(directory);
            }
            InputStream is = sftp.get(downloadFile);
            fileData = IOUtils.toByteArray(is);
            log.info("file:{} is download successful", downloadFile);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
        return fileData;
    }

    /**
     * 删除文件
     *
     * @param directory
     *            要删除文件所在目录
     * @param deleteFile
     *            要删除的文件
     */
    public void delete(String directory, String deleteFile){
        log.info("directory:" + directory + ";deleteFile:" + deleteFile);
        try {
            sftp.cd(directory);
            sftp.rm(deleteFile);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }

    /**
     * 列出目录下的文件
     *
     * @param directory
     *            要列出的目录
     */
    public Vector<?> listFiles(String directory) {
        try {
            return sftp.ls(directory);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 文件是否存在
     *
     * @param directory
     *            要列出的目录
     */
    public boolean isFilePresent(String directory, String fileName){
        log.info("directory:" + directory + ";fileName:" + fileName);
        boolean isFilePresent = false;
        try{
            Vector<ChannelSftp.LsEntry> list = sftp.ls(directory + "/" + fileName);
            if (CollectionUtils.isNotEmpty(list)) {
                isFilePresent = true;
            }
        } catch (Exception e){
            log.error(e.getMessage(), e);
        }
        return isFilePresent;
    }
    public static void main(String[] args) {

    }
}
